I have always done bondo and chopped fiber, and later started using the same with tooling resin with tooling resin mixed in. I have never used an ear liner but have always intended to give removing the cartilage a try but up until now felt if it ain't broke don't fix it. just never took the time to sit down and do one to get the feel of it. If I can stay alive long enough that is going to change just for giggles I guess. How do you guys prefer to do your ears ?